Radio frequency identification technology (RFID) is an emerging automatic identification technology developed in the 1980s. Radio frequency identification technology is a method that uses radio frequency signals to achieve non-contact information transmission through spatial coupling (alternating magnetic fields or electromagnetic fields) and passing them through. Information to achieve the purpose of identification technology.
RFID is a simple wireless system with only two basic components that are used to control, detect and track objects. The system consists of an interrogator (or reader) and a number of transponders (or tags).
Radio Frequency Identification Technology (RFID)
Technology
Initially in the technical field, transponders are electronic modules that can transmit information to reply information. In recent years, due to the rapid development of radio frequency technology, transponders have new claims and meanings, and are also called smart labels or tags. The reader (reader) of the RFID electronic elevator certificate wirelessly communicates with the RFID electronic tag through the antenna, and can read or write the tag identification code and memory data. A typical reader includes a high-frequency module (transmitter and receiver), a control unit, and a reader antenna.
RFID radio frequency identification is a non-contact automatic identification technology. It automatically identifies target objects and obtains relevant data through radio frequency signals. The identification work can be performed in various harsh environments without manual intervention. RFID technology can identify high-speed moving objects and can identify multiple labels at the same time. The operation is quick and easy.
Tag: Composed of a coupling element and a chip, each tag has a unique electronic code and is attached to the object to identify the target object.
Reader: A device that reads (sometimes writes) tag information and can be designed as a handheld rfid reader (eg C5000W) or a stationary reader.
Antenna: Passes RF signals between tags and readers.
working principle
After the tag enters the magnetic field, it receives the RF signal from the reader, sends the product information stored in the chip (passive tag, passive tag or passive tag) by the energy obtained by the inductive current, or is actively sent by the tag at a certain frequency. Signal (Active Tag, active tag or active tag). The reader reads the information and decodes it, and sends it to the central information system for data processing.
A complete RFID system is composed of three parts: a reader and a tag (TAG), a so-called transponder, and an application software system. The working principle is that Reader emits a specific frequency. The radio wave energy is given to the Transponder to drive the Transponder circuit to send the internal data. At this point, the Reader receives the decoded data in sequence and sends it to the application program for processing.
The communication between the RFID card reader and the electronic tag and the energy sensing method can be roughly divided into two types: Inductive Coupling and Backscatter Coupling. Most low-frequency RFIDs use the first type, and higher frequencies use the second method.
The reader can be a read or read/write device depending on the structure and technology used, and is an RFID system information control and processing center. The reader is usually composed of a coupling module, a transceiver module, a control module, and an interface unit. Half-duplex communication is generally used for information exchange between the reader and the transponder, and the reader is coupled to the passive transponder to provide energy and timing. In practical applications, management functions such as collection, processing, and remote transmission of object identification information may be further implemented through Ethernet or WLAN. The transponder is the information carrier of the RFID system. At present, transponders are mostly composed of coupled originals (coils, microstrip antennas, etc.) and microchips constituting a passive unit.
System advantage
RFID is a flexible application technology that is easy to operate, simple and practical, and is especially suitable for automatic control. The identification work requires no manual intervention. It can support both read-only and read-write work modes without contact or aiming. Freedom to work in all kinds of harsh environments: Short-range RF products are not afraid of harsh environments such as oil stains and dust pollution. They can replace barcodes, such as tracking objects on the factory's assembly line; long-range RF products are mostly used for traffic, and the distance can be identified. Up to tens of meters, such as automatic charging or identification of vehicle identities. The radio frequency identification system mainly has the following system advantages:
Reading is quick and easy: The reading of the data does not require a light source, and can even be performed through the outer packaging. The effective identification distance is larger. When using the active label with its own battery, the effective identification distance can reach 30 meters or more;
Fast recognition speed: When the tag enters the magnetic field, the reader can instantly read the information, and can process multiple tags at the same time to realize batch identification;
Large data capacity: The two-dimensional barcode (PDF417) with the largest data capacity can only store up to 2725 digits; if it contains letters, the amount of storage will be less; RFID tags can be expanded to dozens of K according to the needs of users;
Long service life and wide range of applications: Its radio communication method can be applied to high-pollution and radioactive environments such as dust and oil, and its closed packaging greatly exceeds the printed bar code.
Tag data can be changed dynamically: The programmer can write data to the reader, giving the RFID tag the power of an interactive portable data file, and it can write less time than a printed bar code.
Better security: not only can be embedded or attached to different shapes and types of products, but also can set password protection for reading and writing of tag data, thus having higher security;
Dynamic real-time communication: The tag communicates with the reader at a frequency of 50 to 100 times per second, so that as long as the RFID tag is attached to an object within the effective recognition range of the reader, it can dynamically track and monitor its position. .
main application:
1. Application of Library Management System
2. Gas cylinder management application
3. Apparel production line and logistics system management and application
4. Three-meter pre-charging system
5. Hotel door lock management and application
6. Large conference staff channel system
7. Fixed assets management system
8. Management and Application of Pharmaceutical Logistics System
9. Intelligent shelf management
10. Jewelry inventory management.
